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Morning Maddow: March 28

Pres. Obama marks 100 days since Newtown at the White House today as Mayors Against Illegal Guns make today a National Day to Demand Action.

Sen. Chuck Grassley is writing his own gun bill.

A woman is arrested in connection with the gun used to kill CO prisons chief Tom Clements.

Authorities will release redacted search warrants obtained to search the home and car of Newtown shooter Adam Lanza.

Sen. McCain at the U.S.-Mexico border live-tweets an alleged immigration violation.

The NYPD changes its stop-and-frisk policy.

The Justice Department is asked to investigate Shell Oil's Arctic drilling.